clone

#!/bin/bash -e

MetaCall="curl -s http://169.254.169.254/latest/meta-data"

SELF_ID=$($MetaCall/instance-id)
INSTANCE_TYPE=$($MetaCall/instance-type)
SECGRP_NAME=$($MetaCall/security-groups/)
SECGRP_ID=$(aws ec2 describe-security-groups --group-names $SECGRP_NAME | jq -r '.SecurityGroups[0].GroupId')
SUBNET_ID=$($MetaCall/network/interfaces/macs/$($MetaCall/mac)/subnet-id)
NAME=$(hostname -s)
HOSTNAME=$(hostname)

IMAGE_ID=$(aws ec2 describe-images --filters Name=tag-key,Values="Name" Name=tag-value,Values=$NAME --owners self \
   |jq -r '.Images[0].ImageId')

if [ $IMAGE_ID = null ]
then
	echo "Creating AMI image."
	sync
	IMAGE_ID=$(aws ec2 create-image --instance-id $SELF_ID --no-reboot --name $NAME | jq -r '.ImageId')
	while [ ! $(aws ec2 describe-images --image-ids $IMAGE_ID | jq -r '.Images[0].State') = "available" ]
	do
	  sleep 5
	  echo "Waiting for image $IMAGE_ID"
	done
else
	echo "Re-using image $IMAGE_ID which has the same Name Tag"
fi

# tag the image's snapshot
SNAPSHOT_ID=$(aws ec2 describe-images --image-id $IMAGE_ID |jq -r '.Images[0].BlockDeviceMappings[0].Ebs.SnapshotId')
aws ec2 create-tags --resources $IMAGE_ID $SNAPSHOT_ID --tags Key=Name,Value=$NAME

REGION=$($MetaCall/placement/availability-zone | sed -e 's/.$//')
KEY_NAME=$(wget -q -O - http://169.254.169.254/latest/meta-data/public-keys | awk -F= '{print $2}')

# Setup the script that runs in the spot instance. It is responsible for cleaning up the temporary objects created during launch.
cat >user-data.tmp <<EOF
#!/bin/sh
my_id=\$($MetaCall/instance-id)
my_root_vol_id=\$(aws ec2 describe-instances --instance-id \$my_id | jq -r '.Reservations[0].Instances[0].BlockDeviceMappings[0].Ebs.VolumeId')

crontab -l > /root/saved-crontab
crontab < /dev/null

echo $HOSTNAME > /etc/hostname
hostname $HOSTNAME
reboot
EOF

aws ec2 run-instances --image-id $IMAGE_ID --count 1 --instance-type $INSTANCE_TYPE --key-name $KEY_NAME \
	--security-group-ids $SECGRP_ID --subnet-id $SUBNET_ID --user-data "$(cat ./user-data.tmp)" > instance.tmp

NEW_INSTANCE_ID=$(jq -r '.Instances[0].InstanceId' < instance.tmp)

aws ec2 create-tags --resources $NEW_INSTANCE_ID --tags Key=Name,Value="$NAME(clone)" --region $REGION
aws ec2 create-tags --resources $NEW_INSTANCE_ID --tags Key=hostname,Value=$HOSTNAME --region $REGION

echo "Instance launched: $NEW_INSTANCE_ID"